Welding Gases
Acetylene | Air | Argon | Carbon Dioxide(CO2) | Helium
Hydrogen | Nitrogen | Oxygen | Propane
Hydrogen
Hydrogen (H2) the lightest element, has a gaseous specific
gravity of 0.0695 and a boiling point of -423 F (-252.8 C) at
atmospheric pressure. It is a colorless, odorless, tasteless, flammable
gas found at concentrations of about 0.0001 % in air. Hydrogen is
produced by several methods, including steam/methane reforming,
dissociation of ammonia, and recovery from by-product streams from
chemical manufacturing and petroleum reforming. Hydrogen can be stored
and transported as either a gas a cryogenic liquid.
In the welding industry, hydrogen is used as a fuel in underwater
oxy-hydrogen torches, and for metal welding and brazing. Hydrogen
is widely used in petroleum refining processes such as hydrotreating,
catalytic reforming, and hydro-cracking. It is used in the food industry
for turning inedible grease into soaps and animal feeds. It is a raw
material for innumerable chemical processes ranging from the
manufacturing of high-density polyethylene and polypropylene resins to
the hydrogenation of food-grade oils. Hydrogen is also used
as a reducing gas in metals processing operations. Applications in the
electronics industry are found in the manufacture of silicon wafers and
computer chips. Rocket engine fuel is another major use for hydrogen
since weight and energy considerations are paramount to its success.
DOT Information |
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| DOT Name: | Hydrogen | |
| DOT Hazard Class: | Flammable Gas | |
| DOT Label: | Flammable Gas | |
| DOT ID No.: | UN1049 | |
| CAS No.: | 1333-74-0 | |
| Valve Outlet: | CGA 350, LB-CGA 110/170 | |
| Physical State in High Pressure Cylinder: Gas | ||
| Toxicity: | Non-toxic | |
| Fire Potential: | Flammable | |
| Boiling Point | ||
| Temperature: | -423.0 deg. F (-252.8 deg. C) | |
| Liquid Density: | 4.43 lb./ft3 | |
| Latent Heat: | 95.0 BTU/lb. | |
| Critical Point | ||
| Temperature: | -400.3 deg. F | |
| Pressure: | 187.51 PSIA | |
| Melting Point | ||
| Temperature: | -434.8 deg. F | |
| Pressure: | 1.021 PSIA | |
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